Having Sufficient Co2 Is Essential - Oceanic Safety Systems Freedivers Recovery Vest Mark II-S User Manual

III. HAVING SUFFICIENT CO2 IS ESSENTIAL
Note: The danger is if you use cylinders too small for
your trigger depth. Using cylinders with more capac-
ity is acceptable because the extra gas is vented pas
the over-pressure valve. For example, the deepest
you want to dive with two 38gm cylinders is 41 me-
ters. Diving deeper than that will not provide enough
lift.
Setting your maximum depth trigger to achieve 8
kilos (18 lbs) of lift is dependent upon the number
of grams of CO2 contained within the cylinders. For
exact information, use the table at the right. For an
approximation, use the rules of thumb below:
For CO2 weights of 136 gms or less, just divide the
total by 2 to arrive at a value in meters. For example,
if you are using two 38 gram cylinders, you would add
their weights together and divide by two (38+38)/2 = 38
to arrive at the depth providing 8 kilos (18 pounds) of lift.
For equal-weight cylinders use the weight of one cylinder
as the maximum depth in meters to provide 8 kilos (18
pounds) of lift. Note the chart at the right, where two 38
gram cylinders provide 18 kilos (18 pounds) of lift at 41
meters.
Warning Do not use with less than 66
grams total of CO2.
Note Some international travelers
have found CO2 cylinders at marine
stores and sailing shops.
For CO2 weights of 136 gms or more, add the
combined weights of the cylinders and divide by two.
Then add 10% of the combined weight for the total
depth in meters to provide 8 kilos (18 pounds) of lift. For
example, with two 68 gram CO2 cylinders, the combined
weight of CO2 is 136 grams (2 x 68.) 10% of 136 is 14.
Add 68 plus 14 to arrive at 82. See the lower arrow in
the chart to the right.
Freedivers Recovery Vest Mark II-S copyright Oceanic Safety Systems LLC., 2015
15 15